Details

• Brand:

  

• SKU:

  21250-5NA4A

• Other Names:

  Engine Coolant Thermostat Kit, Water Valve, Control Valve, Valve Assembly-Water Control

• Description:

  Description:

  Genuine OEM Nissan Engine Coolant Control Valve Assembly — Part # 21250-5NA4A

  Restore proper coolant flow management to your Nissan Altima 2.0T with the factory-correct coolant control valve. This genuine OEM water control valve assembly is a critical component of the KR20DDT engine's electronic cooling system — electronically regulating coolant flow to the heater core, turbocharger, and engine block for optimal thermal management and fuel efficiency. Includes gasket — current superseded part number covering the full 2019+ Altima 2.0T production run.

  Part Details:

  • Part Number: 21250-5NA4A
  • Replaces: 21250-5NA0A, 21250-5NA1A, 21250-5NA2A, 21250-5NA3A
  • Other Names: Valve Assy-Water Control, Engine Coolant Control Valve, Water Control Valve, Coolant Valve Assembly, Engine Coolant Thermostat Kit
  • Condition: New, Genuine OEM Nissan
  • Application: 2.0L Turbo KR20DDT engine
  • ✅ Includes Gasket

  ⚠️ Non-Reusable O-Ring — Critical: This assembly has a related O-ring that cannot be reused or reinstalled once removed. A new O-ring must be used during installation. Confirm O-ring availability before beginning the repair — reusing the original O-ring risks a coolant leak after installation.

  Compatible Vehicles:

  • 2019–2025 Nissan Altima (2.0T — KR20DDT engine)
  • 2019–2025 Nissan Murano (2.0T — confirm VIN)

  Always confirm fitment using your VIN before purchasing — fits 2.0L Turbo models only, not the 2.5L Altima.

  Why buy OEM? The coolant control valve on the KR20DDT is an electronically controlled component — aftermarket alternatives frequently use inferior solenoid materials, incorrect flow rates, or incompatible electrical connectors that trigger cooling system fault codes or cause incorrect thermal management. The genuine Nissan valve is the only unit calibrated to the factory ECM's control parameters.

  Symptoms this part fixes:

  • Poor cabin heater output despite engine reaching operating temperature
  • Engine overheating or slow to reach operating temperature
  • Coolant leak at the valve body or gasket sealing surface
  • Check engine or cooling system warning light
  • Fault codes related to coolant temperature or coolant flow control

  Ships fast from Walser Nissan Wayzata — an authorized Nissan dealership. Message us your VIN and we'll confirm fitment before you buy.

• Condition: New
• Notes: Part has related component that cannot be reused/reinstalled. o-ring.
• Applications: 2.0L.
• Replaces:

  212505NA0A, 212505NA1A, 212505NA2A, 212505NA3A

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